An image watermarking model based on visual secret sharing (VSS) is proposed for protection of ownership. In the embedding phase, the watermark is first divided by VSS into two parts: a hiding watermark and a secret watermark. Then only the hiding watermark is embedded into the original image and the secret watermark is reserved for watermark extracting by the owner. In the extracting phase, the hiding watermark is extracted from the watermarked image first and then directly superimposed on the secret watermark to recover the watermark information.
A method that employs the time advance for locating the position of mobile phone is proposed. The advantage of the proposed technique is that it can work at the current system, such as GSM, without any change hardware equipment. In this paper, we first add the software into the mobile phone for detecting the lime advance, power intensity and quality factor and so on. Then, these parameters can be used to estimate the position of mobile handset. This raw data will be transmitted to the Operator Maintenance Center (OMC) for further processing and applications. The experimental results show that the proposed method can provide an accuracy position to trace the mobile phone in the GSM (Global system for Mobile).
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